larper

noun

a person who participates in live-action role-playing games (LARP), in which players physically act out their characters in a fictional setting

Usage: informal; often used in gaming and entertainment communities

Examples

She's been a dedicated larper for five years, attending fantasy conventions every summer.
The larpers gathered in the forest to begin their weekend-long medieval adventure.
Many larpers invest significant time and money in creating authentic costumes for their characters.
He started as a casual larper but now helps organize events for the local gaming community.
The larper carefully stayed in character throughout the entire three-day event.